Simple script in linux:

MrOletta

NEW PROBLEM:

I'm new to programming a shell script. In fact I just started reading on it, heh! I have a huge list of files, and I'm looking to write a shell script that'll execute one line for each file in the directory.

So...let's say I have a folder with file names such as 101010.ctl, 101011.ctl, 101012.ctl and I want to run the command

mpb 101010.ctl>&101010.out

How do i get the shell script to step through the files in the directory executing that command with the particular filename.






SECOND PROBLEM SOLVED:

string itos(int i)	// convert int to string
	{
		stringstream s;
		s << i;
		return s.str();
	}

Hey everyone,
I'm working on a program to write files that I need to run calculations on.

Basically the user will enter values called

center
x
y

I'm going to run some code, but basically I want it to output a file with the name

center + x + y.ctl

So say our center was 10, our x was 20, and our y was 30-32:

102030.ctl
102031.ctl
102032.ctl

Usually if it was just a string, I could use something like

outData.open(output.c_str() );

where the user specified output.

Anyone point me in the right direction? Or what command I should be looking at? It's been about 3 years since i've had C++.

So basically i'm looking for something like

outData.open(centerxy.ctl);

neth

just concatenate the string and then open it.

string filename = center +x + y+".ctl";
outstream.open(filename);

Smasher

This should work:

int center = 10878, x = 27897, y = 34;
char d[50];
sprintf(d, "%d%d%d.ctl", center, x, y);
ofstream fout(d);
fout << "hello world" << std::endl;

sprintf can also be used for floats and a bunch of other types by changing the %d.

Jimmy King

MrOletta wrote: »

NEW PROBLEM:

I'm new to programming a shell script. In fact I just started reading on it, heh! I have a huge list of files, and I'm looking to write a shell script that'll execute one line for each file in the directory.

So...let's say I have a folder with file names such as 101010.ctl, 101011.ctl, 101012.ctl and I want to run the command

mpb 101010.ctl>&101010.out

How do i get the shell script to step through the files in the directory executing that command with the particular filename.

Well, you said second problem solved, so I'm not sure if you meant this one or the old one which was now the second in the post.

Anyway, like so.

#!/bin/bash

for i in `find . -name "*.ctl" -print 2>/dev/null`
do
    echo Processing file: $i
    mpb $i.ctl>&$i.out
done
echo END: `date`

Well, that'll end you up with, say 101010.ctl.out, but you can run it through the cut command to grab just the name without the extension if you want.

Janin

Use "basename" to chop off the file extension.

basename somefile.ext .ext # returns "somefile"

MrOletta

That's perfect. Thanks everyone for the help. Now to let the computers chug out the computational analysis for a good 36 hours.

UndefinedMonkey

MrOletta wrote: »

NEW PROBLEM:

I'm new to programming a shell script. In fact I just started reading on it, heh! I have a huge list of files, and I'm looking to write a shell script that'll execute one line for each file in the directory.

So...let's say I have a folder with file names such as 101010.ctl, 101011.ctl, 101012.ctl and I want to run the command

mpb 101010.ctl>&101010.out

How do i get the shell script to step through the files in the directory executing that command with the particular filename.

If you really want to be insane:

1. Get a newline-separated list of all the files in the directory that you want. Use ls and pipe it into a file (might have to set --color=no depending on how you have your terminal set up.)
2. Process this list with sed. Do this: cat filenamelist | sed -e 's/\(^[a-zA-Z0-9_]*\)\.ctl/mpb \1.ctl >& \1.out' > exelist
3. cat exelist... you should have a list of commands in the form "mpb 101010.ctl >& 101010.out", separated by newlines.
4. If so, chmod exelist to 777 and run it.